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Question 1 of 1
1. Question
A nurse is to administer promethazine (Phenergan®) 12.5 mg intramuscularly (IM) stat to a client. The medication is supplied in an ampule of 50 mg/mL. How many milliliters should the nurse administer to the client?
Correct
Answer & Rationale:
ANSWER: 2
Use a proportion formula:
50 mg : 1 mL :: 12.5 mg : X mL
Multiple the extremes and then the means and solve for X:
50X = 12.5 mg
X = 12.5/50 = 0.25
Medication is always expressed with a 0 preceding the decimal.
Incorrect
Answer & Rationale:
ANSWER: 2
Use a proportion formula:
50 mg : 1 mL :: 12.5 mg : X mL
Multiple the extremes and then the means and solve for X:
50X = 12.5 mg
X = 12.5/50 = 0.25
Medication is always expressed with a 0 preceding the decimal.
Promethazine (Phenergan)
Usual Dose:
Adult: 25 mg PO, PR, IM, or IV
Pediatric: 6.25–25 mg PO or PR
Usual Indications
Relief of symptoms of seasonal and perennial allergic rhinitis, allergic conjunctivitis, uncomplicated urticaria, and angioedema; ameliorates allergic reactions; relief of discomfort associated with dermographism; used as adjunctive therapy in